Page 83 of the manual says: When there is a selection active:
1. Press or hold down the arrow keys on your keyboard to move the selection 1 pixel at a time.
a. Hold down the Shift key to move 10 pixels at a time.
2. Click and drag inside the selection when the Selection Tool is active to move it.
I can move the selection with the arrow or shift-arrow keys, but trying 2 above modifies the selection depending upon the mode of the selection tool. Am I missing something obvious ?